[Material]All the products are made of Solid Brass construction. Compared with stainless steel and plastic, it is more corrosion-resistant and , and can meet the needs of air pumping and air pressure measurement in various scenarios. [Chucks' Size]The closed flow air chuck has 1/4inch FNPT air inlet,ball air chuck function is to enable the shutoff valve to shut down the air flow when the stem is not opened. The Closed Flow Tire Chuck also has 1/4inch Female NPT THREADS fit most air inflators. The Dual Head Air Chuck has 1/4inch FNPT air inlet,the maximum air pressure is 150 pounds per square inch.All the thread is 1/4inch Female NPT,suit for any 1/4inch Male NPT fittings. [Adapters' Size]1/4inch Coupling x 1/4inch Male NPT Threaded Full Flow Quick Connect which can be used with the 1/4inch Female NPT air chuck. Colour: gold Material: brass Package Contents: 1 * closed flow air chuck 1 * closed flow tire chuck 1 * dual head air chuck 3 * air hose quick connect adapter 1 * raw material tape (random color, don't accept the specified color) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.